单选题Directions: In this part there are four
passages, each with four suggested answers..Choose the one that you think is the
best answer. Mark your Answer Sheet by drawing with a pencil a short bar across
the corresponding letter in the brackets. Some
pessimistic experts feel that the automobile is bound to fall into disuse. They
see a day in the not-too-distant future when all autos will be abandoned and
allowed to rust. Other authorities, however, think the auto is here to stay.
They hold that the car will remain a leading means of travel in the foreseeable,
future. The motorcar will undoubtedly change significantly over
the next 30 years, It should become smaller, safer, and more economical, and
should not be powered by the gasoline engine. The car of the future should be
far more pollution-free than present types. Regardless of its
power source, the auto in the future will still be the main problem in urban
traffic congestion (拥挤). One, proposed solution to this problem is the automated
highway system. When the auto enters the. highway system, a
retractable .(可伸缩的)arm. will drop from the auto and make contact with a rail,
which is similar to those powering subway trains electrically. Once attached to
the rail, the car will become electrically powered from the system, and control
of the vehicle will pass to a central computer. The computer will then monitor
all of the car's movements. The driver will. use a telephone to
dial instructions about his destination into the system. The computer will
calculate the best route, and reserve space for the car all the way to the
correct exit from the highway. The driver will then be free to relax and wait
for the buzzer (蜂鸣器)that will warn of his coming exit. It is estimated that an
automated highway will be able to handle 10,000 vehicles per hour, compared with
the 1,400 to 2,000 vehicles that can be carried by a present day highway.
单选题
One significant improvement in the future car may probably be ______